# -*- coding: utf-8 -*-

import re
from django.forms.extras.widgets import SelectDateWidget
from django.forms.widgets import Widget, Select, MultiWidget
from django.utils.safestring import mark_safe
from django.contrib.admin.widgets import AdminFileWidget
from django.utils.translation import ugettext as _
from django.utils.safestring import mark_safe
from django.conf import settings
from PIL import Image
import os

try:
    from functools import update_wrapper, wraps
except ImportError:
    from django.utils.functional import update_wrapper, wraps  # Python 2.4 fallback.

from django.contrib.auth import REDIRECT_FIELD_NAME
from django.http import HttpResponseRedirect
from django.utils.decorators import available_attrs
from django.utils.http import urlquote

from datetime import *

# Attempt to match many time formats:
# Example: "12:34:56 P.M."  matches:
# ('12', '34', ':56', '56', 'P.M.', 'P', '.', 'M', '.')
# ('12', '34', ':56', '56', 'P.M.')
# Note that the colon ":" before seconds is optional, but only if seconds are omitted
time_pattern = r'(\d\d?):(\d\d)(:(\d\d))? *([aApP]\.?[mM]\.?)?$'

RE_TIME = re.compile(time_pattern)

# The following are just more readable ways to access re.matched groups:
HOURS = 0
MINUTES = 1
SECONDS = 3
MERIDIEM = 4

# Calcula a idade  
def calculateAge(dia,mes,ano):
    # Valida os campos passado
    if int(dia) == 0 or int(mes) == 0 or int(ano) == 0:
        return 0
    born = date(int(ano), int(mes),int(dia))
    today = date.today()
    try:
        birthday = date(today.year, born.month, born.day)
    except ValueError:
        birthday = date(today.year, born.month, born.day - 1)
    if birthday > today:
        return today.year - born.year - 1
    else:
        return today.year - born.year

class SelectTimeWidget(Widget):
    """
    A Widget that splits time input into <select> elements.
    Allows form to show as 24hr: <hour>:<minute>:<second>, (default)
    or as 12hr: <hour>:<minute>:<second> <am|pm> 
    
    Also allows user-defined increments for minutes/seconds
    """
    hour_field = '%s_hour'
    minute_field = '%s_minute'
    second_field = '%s_second' 
    meridiem_field = '%s_meridiem'
    twelve_hr = False # Default to 24hr.
    
    def __init__(self, attrs=None, hour_step=None, minute_step=None, second_step=None, twelve_hr=False):
        """
        hour_step, minute_step, second_step are optional step values for
        for the range of values for the associated select element
        twelve_hr: If True, forces the output to be in 12-hr format (rather than 24-hr)
        """
        self.attrs = attrs or {}
        
        if twelve_hr:
            self.twelve_hr = True # Do 12hr (rather than 24hr)
            self.meridiem_val = 'a.m.' # Default to Morning (A.M.)
        
        if hour_step and twelve_hr:
            self.hours = range(1,13,hour_step) 
        elif hour_step: # 24hr, with stepping.
            self.hours = range(0,24,hour_step)
        elif twelve_hr: # 12hr, no stepping
            self.hours = range(1,13)
        else: # 24hr, no stepping
            self.hours = range(0,24) 

        if minute_step:
            self.minutes = range(0,60,minute_step)
        else:
            self.minutes = range(0,60)

        if second_step:
            self.seconds = range(0,60,second_step)
        else:
            self.seconds = range(0,60)

    def render(self, name, value, attrs=None):
        try: # try to get time values from a datetime.time object (value)
            hour_val, minute_val, second_val = value.hour, value.minute, value.second
            if self.twelve_hr:
                if hour_val >= 12:
                    self.meridiem_val = 'p.m.'
                else:
                    self.meridiem_val = 'a.m.'
        except AttributeError:
            hour_val = minute_val = second_val = 0
            if isinstance(value, basestring):
                match = RE_TIME.match(value)
                if match:
                    time_groups = match.groups();
                    hour_val = int(time_groups[HOURS]) % 24 # force to range(0-24)
                    minute_val = int(time_groups[MINUTES]) 
                    if time_groups[SECONDS] is None:
                        second_val = 0
                    else:
                        second_val = int(time_groups[SECONDS])
                    
                    # check to see if meridiem was passed in
                    if time_groups[MERIDIEM] is not None:
                        self.meridiem_val = time_groups[MERIDIEM]
                    else: # otherwise, set the meridiem based on the time
                        if self.twelve_hr:
                            if hour_val >= 12:
                                self.meridiem_val = 'p.m.'
                            else:
                                self.meridiem_val = 'a.m.'
                        else:
                            self.meridiem_val = None
                    

        # If we're doing a 12-hr clock, there will be a meridiem value, so make sure the
        # hours get printed correctly
        if self.twelve_hr and self.meridiem_val:
            if self.meridiem_val.lower().startswith('p') and hour_val > 12 and hour_val < 24:
                hour_val = hour_val % 12
        elif hour_val == 0:
            hour_val = 12
            
        output = []
        if 'id' in self.attrs:
            id_ = self.attrs['id']
        else:
            id_ = 'id_%s' % name

        # For times to get displayed correctly, the values MUST be converted to unicode
        # When Select builds a list of options, it checks against Unicode values
        hour_val = u"%.2d" % hour_val
        minute_val = u"%.2d" % minute_val
        second_val = u"%.2d" % second_val

        hour_choices = [("%.2d"%i, "%.2d"%i) for i in self.hours]
        local_attrs = self.build_attrs(id=self.hour_field % id_)
        select_html = Select(choices=hour_choices).render(self.hour_field % name, hour_val, local_attrs)
        output.append(select_html)

        minute_choices = [("%.2d"%i, "%.2d"%i) for i in self.minutes]
        local_attrs['id'] = self.minute_field % id_
        select_html = Select(choices=minute_choices).render(self.minute_field % name, minute_val, local_attrs)
        output.append(select_html)

        second_choices = [("%.2d"%i, "%.2d"%i) for i in self.seconds]
        local_attrs['id'] = self.second_field % id_
        select_html = Select(choices=second_choices).render(self.second_field % name, second_val, local_attrs)
        output.append(select_html)
    
        if self.twelve_hr:
            #  If we were given an initial value, make sure the correct meridiem gets selected.
            if self.meridiem_val is not None and  self.meridiem_val.startswith('p'):
                    meridiem_choices = [('p.m.','p.m.'), ('a.m.','a.m.')]
            else:
                meridiem_choices = [('a.m.','a.m.'), ('p.m.','p.m.')]

            local_attrs['id'] = local_attrs['id'] = self.meridiem_field % id_
            select_html = Select(choices=meridiem_choices).render(self.meridiem_field % name, self.meridiem_val, local_attrs)
            output.append(select_html)

        return mark_safe(u'\n'.join(output))

    def id_for_label(self, id_):
        return '%s_hour' % id_
    id_for_label = classmethod(id_for_label)

    def value_from_datadict(self, data, files, name):
        # if there's not h:m:s data, assume zero:
        h = data.get(self.hour_field % name, 0) # hour
        m = data.get(self.minute_field % name, 0) # minute 
        s = data.get(self.second_field % name, 0) # second

        meridiem = data.get(self.meridiem_field % name, None)

        #NOTE: if meridiem is None, assume 24-hr
        if meridiem is not None:
            if meridiem.lower().startswith('p') and int(h) != 12:
                h = (int(h)+12)%24 
            elif meridiem.lower().startswith('a') and int(h) == 12:
                h = 0
        
        if (int(h) == 0 or h) and m and s:
            return '%s:%s:%s' % (h, m, s)

        return data.get(name, None)
        
try:
    from sorl.thumbnail.main import DjangoThumbnail
    def thumbnail(image_path):
        t = DjangoThumbnail(relative_source=image_path, requested_size=(200,200))
        return u'<img src="%s" alt="%s" />' % (t.absolute_url, image_path)
except ImportError:
    def thumbnail(image_path):
        absolute_url = os.path.join(settings.MEDIA_ROOT, image_path)
        return u'<img src="%s" alt="%s" />' % (absolute_url, image_path)
class AdminImageWidget(AdminFileWidget):
    def render(self, name, value, attrs=None):
        output = []
        if value and getattr(value, "url", None):
            image_url = value.url
            file_name=str(value)
            output.append(u' <a href="%s" target="_blank"> Atualmente: %s<br/></a> %s ' % \
                (image_url,file_name,  _('Change:')))
        output.append(super(AdminFileWidget, self).render(name, value, attrs))        
        return mark_safe(u''.join(output))
        
# Decorator dos usuarios
def user_passes_test_tcc(test_func, login_url=None, redirect_field_name=REDIRECT_FIELD_NAME):
    """
    Decorator for views that checks that the user passes the given test,
    redirecting to the log-in page if necessary. The test should be a callable
    that takes the user object and returns True if the user passes.
    """
    if not login_url:
        from django.conf import settings
        login_url = settings.LOGIN_URL

    def decorator(view_func):
        def _wrapped_view(request, *args, **kwargs):
            if test_func(request.user):
                return view_func(request, *args, **kwargs)
            path = urlquote(request.get_full_path())
            tup = login_url, redirect_field_name, path
            return HttpResponseRedirect('%s?%s=%s' % tup)
        return wraps(view_func, assigned=available_attrs(view_func))(_wrapped_view)
    return decorator

def permission_required_tcc(perm, login_url=None, todaPermissao = None):
    """
    Decorator for views that checks whether a user has a particular permission
    enabled, redirecting to the log-in page if necessary.
    """
    return user_passes_test_tcc(lambda u: u.has_perm(perm) if type(perm) != list else permissoes_tcc(u,perm,todaPermissao), login_url=login_url)
        
def permissoes_tcc(u,perms,todaPermissao):
    '''
    Valida se o usuário possui todas as permissões ou uma delas.
    '''
    lPerm = False
    if type(perms) == list:
        if todaPermissao:
            u.has_perms(perms)
        else:        
            for perm in perms:
                if u.has_perm(perm):
                    lPerm = True
            return lPerm
    else:
        return False
    
